To the problem of high capital formation rate and low consumption rate, this paper builds a reasonable capital formation rate model that will certainly realize the target of full employment, and then, using the model, it estimates the reasonable capital formation rate and the corresponding consumption rate in China. As the analysis shows, the technical feasible investment productivity and the natural economic growth rate are determined the capital formation rate that realize the full employment, but mainly depend on the latter. Because of different economic groups have different investment productivity, the estimation shows that, the increase of private, foreign investment and other economic components with more efficiency in national economy will internally need to decrease the capital formation rate to 18% -25%. In the current national ownership structure, the reasonable capital formation rate or savings rate should not over 32.4% , accordingly, the consumption rate should not below 67.6%.